I consider switching to ticktick. First hurdle: Import does not work. In my case it is from Toodledo.
I go to https://ticktick.com/webapp/#settings/backup - choose import from Toodledo - select the file. "Something" is happening, the UI updates and ... no new tasks in "all tasks"
I have tried both to backup from toodledo but also gave it at try to save i CSV format.